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Logical Structure

Conceptually, a big difference usually exists between XML and HTML markup. With a few exceptions, most HTML tags perform functions related to how the content is displayed. XML markup, on the other hand, is meant to convey what the content means.

XML uses its start tags and end tags as containers; the start tag, the content, and the end tag form a single element. Therefore, elements can be considered to be the objects out of which an XML document is assembled. Each XML document must have only one root element, and all the other elements must be perfectly nested inside that element. Perfectly nested means that if an element contains other elements, those elements must be completely enclosed within that element.


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